Hi Uri.

Am 18.08.19 um 15:38 schrieb Uri Okrent:
> Hi, I've set up haproxy in a docker swarm environment to balance
> between several servers.  The server task (let's call it foosrv) are
> configured using docker's `replicate` directive to run on multiple
> nodes, and as such, I don't have hostnames or IP addresses until
> runtime.  Luckily, the docker overlay network provides a handy DNS
> record which facilitates finding my foosrv tasks.
> A DNS lookup of `tasks.foosrv` resolves to an array of IP addresses
> for each of my replicated foosrv tasks.  Seems like a perfect fit for
> the server-template directive, and it is.  The wrinkle is, I'm not
> sure how exactly to use the params* in this scenario. According to the
> documentation, `server-template` takes all the same params as
> `server`.  Some of those params though, require an argument which
> would depend on the actual backend server.
> In my case, I need to configure sticky sessions using the cookie param
> which requires you to pass a value.  Based on reading the docs it
> looks like it would look something like this:
> ```
> server-template srv 3 tasks.foosrv:80 check cookie foocookie insert
> # would be equivalent to:
> server srv1 check cookie foocookie insert
> server srv2 check cookie foocookie insert
> server srv3 check cookie foocookie insert
> ```
> As you can see the entire group shares the same cookie value, which
> doesn't work for my purposes as the replicas have no shared state.  Is
> there any ability to add some sort of template variable based on the
> `num`?  Some other way to accomplish what I need?

There is a open feature request on GH for this.


I don't know if anyone works on this, patches are welcome. Maybe you can up-vote
to the feature to know how many people would also like to have this feature.

> Thanks

Best regards

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